I have been using Yin Chiao for many years. a Chinese friend wrote the name in Chinese, and I took it to China town in Oakland Ca. Any time you feel a cold coming on, first signs take this and it never appears. This product get's you through the winter with out getting sick. If you get it at the health stores it cost more and they order 450 MG. iHerb.com not only has a better price you get 600mg. I give this herb a 5 star and the same for this Co. iHerb.com Vivian Thomas

Great price. I've been using this for several years. If I take this at the first signs of a cold, it usually prevents me from getting sick. Also have used the similar formula from china. Prefer Planetary Herbals because I can trust the ingredients.

At the very first sign of a cold (and you know your own personal signs) take six of these tablets. Then take four every four hours for the first 24 hours. It works for me every time. And this brand seems to work better than Dr. Shen's. I always have them on hand and take them with me when I travel.